Great web page. I would like to know about the engraved #'s they put on gold antique/vintage Tiffany pins. I bought an 18k gold pin in the early 80's at a flea market and many years later I found a 14k gold pin from T&Co. that has an engraved # on it too. What are these #'s? It doesn't say 1-20 to show its one of that collection...its just number off to the side. Would love to know what this is. Thank you.